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validator.py
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validator.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Script for spatial data validation
# Authors: Betka & Jachym
#
__version__ = 0.2
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.core import *
from osgeo import ogr
from cStringIO import StringIO
import json
import re
import os, sys
NOT_PROVIDED = u'nezadáno'
MISSING = u'chybí'
EXTRA = u'navíc'
NOT_MATCH = u'neodpovídá'
class AttributeNotFound(Exception):
def __init__(self, msg):
Exception.__init__(self, msg)
class Validator(object):
"""Class for validating features
:param validator: function, which will do the job
:param attributes: list of attributes to be checked
:param allowed_values: object with allowed values
:param where: WHERE statement for feature selection
"""
def __init__(self, validator, attributes=None,
allowed_values=None, where=None, islike=None):
self.__attributes = attributes
self.__validate_function = validator
self.__allowed_values = allowed_values
self.__where = where
self.__islike = islike
def validate(self, layer):
"""Validate given features with given method
you can specify attribute and allowed values of given attribute as well
"""
features = self.get_features(layer)
errors = self.__validate_function(features,
attributes=self.__attributes,
allowed_values=self.__allowed_values,
islike=self.__islike)
return errors
def get_features(self, layer):
"""Get features from layer eventually with given WHERE statement
"""
features = None
if self.__where:
qgsexpr = QgsExpression(self.__where)
if qgsexpr.hasParserError():
raise AttributeNotFound('error in where statement: "%s"' %(self.__where))
where_columns = qgsexpr.referencedColumns()
fields = layer.pendingFields()
layer_columns = []
for f in fields:
layer_columns.append(f.name())
for i in where_columns:
if i not in layer_columns:
raise AttributeNotFound('error in where statement, where attribute "%s" not in layer' %(i))
qgsreq = QgsFeatureRequest(qgsexpr)
features = layer.getFeatures(qgsreq)
else:
features = layer.getFeatures()
return features
def __check_attributes(features, allowed_values,
attributes=None, islike=None):
"""Empty proxy function for calling check_attributes with propper parameters
"""
return check_attributes(features, allowed_values)
def __is_like(features, attributes=None, islike=None,
allowed_values=None):
"""Empty proxy function for calling check_not_null with propper parameters
"""
return is_like(features, attributes, islike)
def validator_factory(rule):
"""Creates instances of Validator, based on 'rules' json, which can contain
following keys:
validator - function, which will validate
attributes - list of attributes, which will be validated
attribute - single attribute with same meaning
allowed_values - dictionary with attribute_name as key and list of allowed
values
"""
validing_function = None
attributes = None
allowed_values = None
where = None
islike = None
try:
if rule['validator'] == "islike":
validing_function = __is_like
elif rule['validator'] == "allowedvalues":
validing_function = __check_attributes
except:
pass
if not validing_function:
raise Exception("No validation function found for validator '%s'" %\
rule['validator'])
if rule.has_key('attribute'):
attributes = [rule['attribute']]
elif rule.has_key('attributes'):
attributes = rule['attributes']
if rule.has_key('allowed_values'):
allowed_values = rule['allowed_values']
if rule.has_key('where'):
where = rule['where']
if rule.has_key('islike'):
islike = rule['islike']
validator = Validator(validing_function,
attributes=attributes,
allowed_values=allowed_values,
where=where,
islike=islike)
return validator
def check_existency(attribute, feature):
"""Check if attribute which has to be validated exists in layer,
if doesnt it will raise exception"""
attrs = feature.fields()
list_of_attrs = []
for a in attrs:
list_of_attrs.append(a.name())
if attribute in list_of_attrs:
feature_value = feature[attribute]
else:
raise AttributeNotFound('Not found attibute "%s" in validated layer' % (attribute))
return feature_value
def get_attributes_validator(attribute, allowed_values):
"""Returns function, which will validate given feature based on
allowed_values and attribute
"""
def __is_proper_allowedvalue(feature):
"""This function is the one, which will be called for makeing sure,
feature is all right
Error is also when attribute is NULL, then is written "nezadáno"
"""
feature_value = check_existency(attribute, feature)
if feature_value not in allowed_values:
if feature_value == NULL:
feature_value = NOT_PROVIDED
fid = feature['id']
if fid == NULL:
fid = None
return feature_value
else:
return None
def __is_null(feature):
"""Checking input feature if attribute has filled value.
If attribute is NULL
"""
value = check_existency(attribute, feature)
value = feature[attribute]
if value == NULL:
return MISSING
else:
return None
def __is_not_null(feature):
"""Check whether feature is NOT NULL
"""
value2 = feature[attribute]
if value2 != NULL:
return EXTRA
else:
return None
valid_function = None
if type(allowed_values) == type([]):
valid_function = __is_proper_allowedvalue
elif allowed_values == "NULL":
valid_function = __is_not_null
elif allowed_values == "NOTNULL":
valid_function = __is_null
return valid_function
def check_feature_attributes(feature, allowed_values):
"""Checke for all feature attributes
"""
attributes = {}
for attr in allowed_values.keys():
checking_function = get_attributes_validator(attr, allowed_values[attr])
checked = checking_function(feature)
if checked:
attributes[attr] = checked
feature.setValid(False)
return attributes or None
def check_attributes(features, allowed_values):
"""check for all filled attributes in required detail
"""
false_attributes = {}
for feature in features:
wrong_attributes = check_feature_attributes(feature, allowed_values)
if wrong_attributes:
false_attributes[feature.id()] = wrong_attributes
return false_attributes
def is_like(features, attributes, islike):
"""Check, whether choosen attribute fits to declared template
"""
false_features = {}
attribute = attributes[0]
for feature in features:
value = check_existency(attribute, feature)
#value = feature[attribute]
reached = 0
if value == NULL:
value = 'NULL'
for pattern in islike:
regex = re.compile(pattern)
match = regex.search(value)
if match != None:
reached = 1
break
if reached == 0:
false_features[feature.id()] = {attribute: NOT_MATCH}
return false_features
def merge_errors(old, new):
"""Merge new errors into already existing errors object
"""
for e in new:
if e in old:
copy_old = old[e].copy()
copy_old.update(new[e])
old[e] = copy_old
else:
old[e] = new[e]
return old
def output_layer(layer, errors, err_file):
"""Create new shapefile layer from selected features (with error)
and add new attribute "error_desc" where is written name of attribute
and type of error
"""
provider = layer.dataProvider()
fields = provider.fields()
fields.append(QgsField('error_desc', QVariant.String))
if layer.geometryType()== 0:
writer = QgsVectorFileWriter(err_file, provider.encoding(),
fields, QGis.WKBPoint,
provider.crs())
elif layer.geometryType()== 1:
writer = QgsVectorFileWriter(err_file, provider.encoding(),
fields, QGis.WKBLine,
provider.crs())
elif layer.geometryType()== 2:
writer = QgsVectorFileWriter(err_file, provider.encoding(),
fields, QGis.WKBPolygon,
provider.crs())
layer2 = QgsVectorLayer(err_file, 'l1', 'ogr')
features = layer.selectedFeatures()
layer2.startEditing()
errors_edit = []
for feature in features:
for k in errors.keys():
if k == feature.id():
error = errors[k]
text = []
size = len(error)
loop_size = list(range(size))
for i in loop_size:
key = error.keys()
value = error.values()
string2 = ("""%s - %s""" %(key[i],value[i]))
#string = key[i] + " - " + value[i]
text.append(string2)
all_errors = ', '.join(text)
errors_edit.append(all_errors)
writer.addFeature(feature)
layer2.commitChanges()
return errors_edit
def edit_attribute(errors_edit, err_file):
""" Write error in string as new attribute to output layer
"""
layer = QgsVectorLayer(err_file, 'l1', 'ogr')
layer.startEditing()
delka = len(errors_edit)
loop_size = list(range(delka))
for feature in layer.getFeatures():
for position in loop_size:
if position == feature.id():
feature["error_desc"] = errors_edit[position]
layer.updateFeature(feature)
break
layer.commitChanges()
def validate(rulesfile, outputfile, layer, err_file):
"""Validate selected layer with given rules file, make output shapefile with errors
"""
whole_rulefile = json.load(open(rulesfile))
rules = whole_rulefile.get("rules")
errors = {}
for rule in rules:
validator = validator_factory(rule)
new_errors = validator.validate(layer)
merge_errors(errors, new_errors)
if errors:
layer.setSelectedFeatures(errors.keys())
errors_edit = output_layer(layer, errors, err_file)
edit_attribute(errors_edit, err_file)
def main():
"""Main function, collecting necessary data and running the app
"""
validate(rulesfile, outputfile, layer, err_file)
if __name__ == '__console__':
try:
main()
except:
print "neprobehlo"